1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2006 John-Mark Gurney. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 * 30 */ 31 32 #ifndef _SYS__BUS_DMA_H_ 33 #define _SYS__BUS_DMA_H_ 34 35 typedef int bus_dmasync_op_t; 36 37 /* 38 * bus_dma_tag_t 39 * 40 * A machine-dependent opaque type describing the characteristics 41 * of how to perform DMA mappings. This structure encapsultes 42 * information concerning address and alignment restrictions, number 43 * of S/G segments, amount of data per S/G segment, etc. 44 */ 45 typedef struct bus_dma_tag *bus_dma_tag_t; 46 47 /* 48 * bus_dmamap_t 49 * 50 * DMA mapping instance information. 51 */ 52 typedef struct bus_dmamap *bus_dmamap_t; 53 54 /* 55 * A function that performs driver-specific synchronization on behalf of 56 * busdma. 57 */ 58 typedef enum { 59 BUS_DMA_LOCK = 0x01, 60 BUS_DMA_UNLOCK = 0x02, 61 } bus_dma_lock_op_t; 62 63 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t); 64 65 #endif /* !_SYS__BUS_DMA_H_ */ 66